vocal vs ditty

vocal and ditty both are nouns.

Word	Noun	Adjective	Verb	Adverb
vocal	Yes	Yes	No	No
ditty	Yes	No	No	No

As nouns, ditty is a hyponym of vocal; that is, ditty is a word with a more specific, narrower meaning than vocal:

vocal (noun)	ditty (noun)
music intended to be performed by one or more singers, usually with instrumental accompaniment	a short simple song (or the words of a poem intended to be sung)
a short musical composition with words

vocal (adjective)	ditty (adjective)
having or using the power to produce speech or sound
relating to or designed for or using the singing voice
given to expressing yourself freely or insistently
full of the sound of voices